The decrease across the country is a major breakthrough in efforts to reverse the effects of fentanyl. Researchers and health officials say there is no easy explanation for the trend. The decrease across the country is a major breakthrough in efforts to reverse the effects of fentanyl. Researchers and health officials say there is no easy explanation for the trend. Drug Abuse and Traffic, Deaths (Fatalities), Naloxone (Drug), Fentanyl, Buprenorphine (Drug), Opioids and Opiates, United States Politics and Government NYT > Science